it took years. but in the end ida was able to make everybody care. to this day faded photos of women on her list hang on her wall, alongside a line of scripture that reads, "nothing is hidden, except to be revealed." it's a quote familiar to detectives everywhere. >> and what information do you have? >> reporter: and it's not just there for inspiration. for ida lopez that's a mission statement. >> i have to keep believing that we'll find an answer soon. soon could be months. soon could be years. but i just have to keep believing that today could be the day, today could be the day. >> what about those last seven girls? do you think you'll ever find them? >> i think we will. >> reporter: one of those women, safira mora, was found alive and well a few weeks after this story first aired in december 2010.